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3. The copigmentation of anthocyanins and its role in the color of red wine: A critical review;Boulton;American Journal of Enology and Viticulture,2001
4. Copigmentation of anthocyanins in Cabernet Sauvignon and Merlot wines from the Napa valley of California;Boulton,1999
5. Principle and practices of winemaking;Boulton,1998